Implementation system and method for allocating addresses to slave devices through RS-485 bus

Abstract

The invention discloses an implementation system and method for allocating addresses to slave devices through RS-485 buses, and belongs to the technical field of RS-485 bus control, a plurality of slave devices form an array with M rows and N columns, buses A in the RS-485 buses of N slave devices in each row are mutually connected, buses B in the RS-485 buses of the N slave devices in each row are mutually connected, and buses B in the RS-485 buses of the N slave devices in each row are mutually connected. The slave machines in each row are connected with the bus A of the RS-485 bus of the host through a pair of open points of one relay, the bus B of the RS-485 buses of the M slave machines in each column are connected with one another, and the slave machines in each column are connected with the bus B of the RS-485 bus of the host through a pair of open points of one relay. In the invention, the address can be written into the slave only by closing the relays of the row and the column where the slave needing to write the address is located, so that the sequential address writing of each slave is realized, the address writing of the multiple slave devices can be conveniently realized, the operation is simple, the efficiency is high, the working intensity can be reduced, the cost is relatively low, and the practicability is high. The method is suitable for all systems with RS-485 buses.

Description

technical field [0001] The invention relates to the technical field of RS-485 bus control, in particular to a realization system and method for assigning addresses to slave devices through the RS-485 bus. Background technique [0002] At present, in the measurement and control system composed of the RS-485 bus, the master-slave communication method is generally adopted, that is, a master (generally called the upper computer) and several (not more than 254) slaves (generally called the lower computer) ) communicate through the RS-485 bus. In the master-slave communication mode, the master always initiates the communication. After the slave receives the command, it obtains the control right of the bus, and then sends information to the bus. After the sending, the control right of the bus is returned to the master. When the host communicates with each slave device through the RS-485 bus, it is necessary to distinguish each slave device through the device identification. The ea...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a system and method for realizing the allocation of addresses to slave devices through the RS-485 bus, so as to solve the technical problems of RS-485 bus communication address setting defects in the prior art

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